鄂尔多斯盆地塔巴庙地区上古生界气藏高产地质因素分析

鄂尔多斯盆地塔巴庙地区上古生界气藏为一套致密低渗砂岩储层,产层分布在下石盒子组、山西组及太原组,其中测试高产层集中分布在盒3段及盒2段。这里在对产层特征进行研究的基础上,通过对各地质参数与产能的相关性研究,对控制高产的主要地质因素进行了分析讨论,结果表明,优质的储层条件是产层获得高产的基础,产层含气丰度及地层能量是控制高产的主要地质因素。产层电阻率的大小能反映出含气丰度大小,依据电阻率分布来评价高产层的平面分布,并提出了下一步主要勘探开发目标区。

THE ANALYSIS OF GEOLOGICAL CONTROLLING FACTORS OF HIGH PRODUCTION IN UPPER PALEOZOIC GAS RESERVOIRS IN TABAMIAO AREA,ORDOS BASIN

Upper Paleozoic gas reservoirs are a series of tight sandstone reservoirs with low permeability in Tabamiao area,Ordos Basin.Productive reservoirs are found in Lower Shihezi,Shanxi and Taiyuan formation,including high testing production reservoirs which mainly distribute in He-3 and He-2 member of the Lower Shihezi formation.Based on the study of the characteristics of productive reservoirs and by the analysis of the relativity between geological parameters and production,this paper discusses the main geological factors to cause high production and draw a conclusion that the quality of reservoirs is principal,and gas content and formation energy are the main factors.Based on the conclusion,the paper makes an evaluation on plane distribution of high production reservoirs in Lower Shihezi formation hat reservoir with resistivity which can reflect gas content.